changelog++
changelog++

Added some go version changes for 1.5 and 1.6. I couldn't find the PRs for the 1.5 updates but included the note in the changelog anyway.
hartsock/vault,hartsock/vault,hashicorp/vault,rnaveiras/vault,hashicorp/vault,hashicorp/vault,hashicorp/vault,hashicorp/vault,rnaveiras/vault,rnaveiras/vault,hartsock/vault,hartsock/vault,hartsock/vault,rnaveiras/vault,hashicorp/vault,rnaveiras/vault